Design of a low-power CMOS operational amplifier with common-mode feedback for pipeline analog-to-digital converter applications

Authors : SOHIFUL ANUAR ZAINOL MURAD, IZATUL SYAFINA ISHAK, MOHD FAIRUS AHMAD, SHAIFUL NIZAM MOHYAR

Pages : 1908-1921

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :This paper proposes a design of a low-power operational amplifier insert ignore into journalissuearticles values(op-amp); for pipeline analog-to-digital converter insert ignore into journalissuearticles values(ADC); applications using a 0.13-$\mu $m CMOS process. The folded-cascode topology with NMOS input types is employed for the op-amp design due to a larger output gain compared to PMOS input types. Furthermore, the op-amp is designed with a double detection structure of a common-mode feedback circuit to provide stable feedback voltage. The simulation results show that the proposed op-amp achieved a gain of 64.5 dB and a unity gain bandwidth of 695.1 MHz with a low power consumption of 0.14 mW. In addition, by applying $\pm $1.2 V of input voltage, the output voltage generated by the proposed op-amp design remains at 1.2 V with a constant feedback voltage of 1.3 V. Moreover, the proposed circuit was implemented and simulated successfully in a 1.5-bit per stage pipeline ADC.
Keywords : Analog to digital converter, fully differential op amp, low power, low voltage, pipeline